Britax Monarch, Red Racer Booster

This is an excellent booster seat. It has lots of cushioning, the side impact protection along the sides of the carseat and headrest, and is very sturdy. It is also very easy to put together. It has an adjustable headrest and also the sides of the seat are adjustable to the width of your child as they grow. It also has seatbelt guides that not only show you where to put the seat belt, but they ensure that the seat belt fits properly, and secures your child in nice and tightly. Another great point with the Britax is that when he falls asleep, it is impossible for his head to fall over, he either has his head resting back, or on the side cushion like a pillow so he can finally sleep comfortably in the car. The two drink/snack holders have been fine with our sippy cups, but I have heard complaints that some cups fall out.
We had a different booster by Graco first, and it's seat belt guides we're not as efficient and I always felt like my son could slide his torso out of the back rest any time he wanted to because of how loosely he was restrained by the seat. This is the reason I decided to look for a better seat. I felt like the first one was unsafe. The Britax is a million times better!!! I just love it! We bought two before we even tried it, and it is every bit as great as it looked.
We did find them locally, which was nice, because we could actually see the seats before we bought them.